Біологічна цінність сухих молочних багатокомпонентних сумішей

Abstract

Dry dairy products are in high demand both in the world and in the domestic market of Ukraine and have proven themselves as products of complete nutrition, long-term storage and convenient transportation. Milk protein, which has a high degree of assimilation, is an important component in human nutrition. This is especially true of whey proteins, which by their amino acid composition are among the most valuable proteins of animal origin. The subject of research were milk multicomponent mixtures obtained by spray drying, with the addition of dry whey protein concentrate with a mass fraction of protein of 80% in an amount of from 1.0% to 6.0%. The aim of the study was to determine the amino acid composition and biological value of dry milk formulas in terms of amino acid score and balance of essential amino acids in protein, using the utilization coefficient of amino acid composition and comparative excess. Materials and methods. The amino acid composition of the test samples was determined by acid hydrolysis on an amino acid analyzer LC-2000 (Biotronik, Germany). The qualitative protein composition of dry milk formulas was determined by the calculation method. Results. It was determined that the biological value of the experimental samples with the introduction of whey protein concentrate in the amount of 1%, 2%, 4% and 6% was 78.1%, 78.4%, 79.8% and 82.1%, respectively, compared with control, where it was 68.2%. Based on the calculated values ​​of the utilitarian coefficient and the indicator of comparative redundancy, it was found that the experimental samples with whey protein concentrate in the amount of 4% and 6% had the best balance of amino acid composition of essential amino acids. According to the sum of indicators that characterize the quality of dry multicomponent mixtures, a sample with a dose of 4% concentrate was selected and its formulation was recommended for use in further research during the development of dry fermented milk product technology for consumption in autonomous conditions (army, navy, tourism, etc.).